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Idle is very lean!?
Posted: Thu Jan 05, 2017 6:01 am
by R-12914
Hi Hondata,
if i run my FN2 s/c on idle with or without A/C, the engine runs very lean at about +9/+13 s.trim, closed loop lambda is correct @1.00:
xy.JPG
Idle and s.trim
with A/C on:
9.JPG
Idle and s.trim
with A/C off:
13.JPG
Is it possible to make the Idle more rich or what is a optimal idle-s.trim value?
Thanks!
Re: Idle is very lean!?
Posted: Fri Jan 06, 2017 9:35 am
by R-12914
Hondata,
any news about this?
Re: Idle is very lean!?
Posted: Fri Jan 06, 2017 11:48 pm
by R-12914
My Car is a FN2 with Rotrex C30-94 Supercharger and RC 750CC Injectors.
I have made a another datalog.
The idle you can see at the end of the datalog.
Please take a look on it!
The Map and Datalog see below!
MS_RotrexC30-94_4BAR-HYBRID_06-01-2017.fpcal
Datalog#1_06-01-2017_Run-Pulls-Idle.fpdl
Datalog_warm_IAT-NEU_Idle.fpdl
Re: Idle is very lean!?
Posted: Mon Jan 09, 2017 10:21 am
by Spunkster
Has this been properly tuned on the dyno?
Re: Idle is very lean!?
Posted: Mon Jan 09, 2017 11:36 am
by R-12914
Spunkster wrote:Has this been properly tuned on the dyno?
No, on the road!
Re: Idle is very lean!?
Posted: Mon Jan 09, 2017 12:05 pm
by Spunkster
It may have something to do with the manifold design. Have you discussed the issue with a professional tuner?
Re: Idle is very lean!?
Posted: Mon Jan 09, 2017 2:17 pm
by typer86
I have the same kit mounted. With my old RC 750 injectors and the little 650s... Strim was 0 or little rich but never +10 or higher...
With my dw800 and the tts layout all good.
Did you have no idea what could be wrong? Maybe bad injectors, fuel pump, o-rings?
Re: Idle is very lean!? /resolved
Posted: Wed Jan 11, 2017 12:37 am
by typer86
Spunkster wrote:It may have something to do with the manifold design. Have you discussed the issue with a professional tuner?
SOLUTION found
I found the issue for this case.
Deadtimes of the RC750kit which is mounted is unfortunately to high. (We used the deadtimes from your RC750 starting calibration but tests confirm that it does not match for this kit... Total creazy because other kits which I have seen working fine with your default values...)
So we are currently determine the correct value for this injector kit so we can say the idle + low load the S.TRIM values will be the same...
Update: MAF sensor is going bad... Adjusting the deadtimes does not fix this effect as expected.
First check with an other MAF - the readings AFMflow Volts are OK - new part is ordered...
Re: Idle is very lean!?
Posted: Wed Feb 22, 2017 12:53 pm
by R-12914
No, the problem was a leak (o-rings) of the injectors (manifold-sided).
The problem was solved with new seals together with new ASNU (customized) injectors!
Re: Idle is very lean!?
Posted: Tue Apr 04, 2017 5:15 am
by typer86
R-12914 wrote:No, the problem was a leak (o-rings) of the injectors (manifold-sided).
The problem was solved with new seals together with new ASNU (customized) injectors!
Additional:
The black pipe which is connected to the rotrex was not sealed completely which cause wrong air passed the MAF sensor...
After fix the air leak, XY s.trim vs AFM.c curve looks perfect.